NEUTRON AND X-RAY-EMISSION STUDIES IN A LOW-ENERGY PLASMA-FOCUS

In a low energy Mather-type plasma focus energized by a single 32 mu F capacitor, the X-ray and neutron emission is investigated using time- integrated and time-resolved detectors. The X-ray emission profile has a width (FWHM) of 40-50 ns. The neutron emission profile is broader c ompared to the X-ray emission profile and also delayed by 30-40 ns. To identify different regimes of X-ray emission, an X-ray pin-hole camer a along with different absorption filters is employed. While the X-ray emission is high within a narrow pressure range of 2.0-2.5 mbar, the neutron emission is intense for a wider range of 1.0-4.5 mbar. The int ense X-ray emission seems to originate from the axially moving shock w ave. These results also indicate rather different production mechanism s for X-ray and neutron emission. Also on comparing the X-ray images w ith Al(2 mu m), Al(5 mu m), Al(9 mu m) filters, we find that the bulk of X-rays from the focus filament have energies less than 2 keV.